I found the word, ‘Obama-lite’ in the headline of the Time magazine article (March 17) , titled “Santo: “We’re Not Just An Obama-Lite.” The article quotes the following remark of Rick Santorum aired on a Missouri radio:

"If we keep winning and doing well and we keep winning the states were supposed to win and upsetting in states and do either very well..., we're going to win the nomination. I have no doubt about that whatsoever. We're the candidate that's energizing folks. We're the candidate that has the best chance of beating Barack Obama.... We're not just an Obama-lite."

As I am unfamiliar with the usage of suffix, -lite, I checked its meanings in dictionaries at hand;

Readers English Japanese dictionary defines -lite as;
1. the suffix used for fossils, minerals, explosives, products.
2.a believer of, or in a person.

www.yourdictionary defines it only as stone: used in the names of minerals, rocks, and fossils, e.g. chrysolite, cryolite.

wikitionary.org defines it simply as “used to form names of rocks and minerals
Representing Ancient Greek λίθος (lithos, “stone”).

I don’t think Obama-lite has anything to do with fossils, stones and minerals, nor it does mean Obama-believer, because it’s silly if Santorum said “We're not just an Obama-believer.”

What does Obama-lite mean, and first of all, is “-ite” used here as a suffix to represent for what?

What @Matt said. The productive suffix -lite was perhaps overstretched a bit in Japan-lite, but it's the same basic principle.
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FumbleFingersMar 18 '12 at 1:05

3

@Yoichi Oishi: If you didn't get it from the other one, it's a fairly common device in recent years to append -lite to some well-known noun (in this case Obama), to make a new "word" that means something like a watered-down version of that noun. So, for example, a cheapish car with some luxury features might be called a Lexus-lite. It's usually used a bit disparagingly. Note that it's a "jokey" spelling of "light" - nothing to do with the "technical" suffixes you found in the dictionary.
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FumbleFingersMar 18 '12 at 1:10

@Matt Эллен 5: I totally forgot that I had posted a similar question –“What does Japan-lite probrem?” in August last year. A sign of senile amnesia!. I can close this question. But I was puzzled about Santorum’s statement, “We’re not just an Obama-lite” because it’s a matter of course for hard core or “right wing” Republicans like Santorum not to be a light-weighted Obama as I wrote in the above question. But if “Obama-lite” refers to Mitt Romney as FumbleFingers points out, it makes sense, and my question was resolved.
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Yoichi Oishi♦Mar 18 '12 at 7:22

In this context, it is also a deniable reference to the fact that Mr. Obama counts as "Black" in US terms, which is meaningful to many supporters of Mr. Santorum, who counts as "White".
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John LawlerMar 18 '12 at 15:07

@JohnLawler - don't think so, perhaps a 'pale imitation of Obama'? US politics tends not to get that witty!
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mgbMar 18 '12 at 17:31

Wit is not le mot juste, I fear. Anyhow, like any good metaphor, it works for different people in different ways.
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John LawlerMar 18 '12 at 17:52